@model FloorPlanEditorViewModel
@{
    ViewData["Title"] = Model.FloorPlan.FloorPlanID == 0 ? "New Floor Plan" : Model.FloorPlan.Name;
    ViewData["ProjectSection"] = "Floor Plans";
    var activeFloor = Model.Floors.OrderBy(x => x.SortOrder).ThenBy(x => x.Name).FirstOrDefault();
    var blocksByFloor = Model.Blocks.GroupBy(x => x.FloorPlanFloorID).ToDictionary(x => x.Key, x => x.ToList());
    var transitionsByFloor = Model.Transitions.GroupBy(x => x.FloorPlanFloorID).ToDictionary(x => x.Key, x => x.ToList());
    var selectedBlockId = int.TryParse(Context.Request.Query["selectedBlockId"], out var parsedSelectedBlockId) ? parsedSelectedBlockId : 0;
    string BlockClass(string blockType) => $"floor-plan-block floor-plan-block--{blockType.ToLowerInvariant()}";
    string CssNumber(decimal value) => value.ToString("0.###", System.Globalization.CultureInfo.InvariantCulture);
    string TransitionDetails(FloorPlanTransitionEditViewModel transition)
    {
        var details = $"{transition.FromLocationName} -> {transition.ToLocationName}\n{transition.TransitionType}";
        return string.IsNullOrWhiteSpace(transition.DisplayLabel) ? details : $"{details}\n{transition.DisplayLabel}";
    }
}

<nav class="breadcrumb-trail" aria-label="Breadcrumb">
    <a asp-controller="Projects" asp-action="Index">Projects</a>
    <a asp-controller="Projects" asp-action="Details" asp-route-id="@Model.Project.ProjectID">@Model.Project.ProjectName</a>
    <a asp-action="Index" asp-route-projectId="@Model.Project.ProjectID">Floor Plans</a>
    <span>@Model.FloorPlan.Name</span>
</nav>

<partial name="_ProjectSectionNav" model="Model.Project" />

<div class="page-heading compact">
    <div>
        <p class="eyebrow">Location floor plan</p>
        <h1>@Model.FloorPlan.Name</h1>
    </div>
    <a class="btn btn-outline-secondary" asp-action="Index" asp-route-projectId="@Model.Project.ProjectID">Back to floor plans</a>
</div>

@if (TempData["FloorPlanMessage"] is string message)
{
    <div class="alert alert-success">@message</div>
}
@if (TempData["FloorPlanError"] is string error)
{
    <div class="alert alert-danger">@error</div>
}

<section class="edit-panel floor-plan-meta floor-plan-meta-wide">
    <form asp-action="SavePlan" method="post" class="row g-3">
        <input asp-for="FloorPlan.FloorPlanID" type="hidden" name="FloorPlanID" />
        <input asp-for="FloorPlan.ProjectID" type="hidden" name="ProjectID" />
        <div class="col-md-4">
            <label asp-for="FloorPlan.Name" class="form-label"></label>
            <input asp-for="FloorPlan.Name" class="form-control" name="Name" />
            <span asp-validation-for="FloorPlan.Name" class="text-danger"></span>
        </div>
        <div class="col-md-4">
            <label asp-for="FloorPlan.Description" class="form-label"></label>
            <input asp-for="FloorPlan.Description" class="form-control" name="Description" />
        </div>
        <div class="col-md-2">
            <label class="form-label">Root Location</label>
            <select asp-for="FloorPlan.LocationID" asp-items="Model.LocationOptions" class="form-select" name="LocationID"></select>
        </div>
        <div class="col-md-2 d-flex align-items-end">
            <button class="btn btn-outline-primary w-100" type="submit">Save details</button>
        </div>
        <div class="col-12">
            <p class="muted mb-0">Linked Location: @(string.IsNullOrWhiteSpace(Model.FloorPlan.LocationPath) ? "A matching Location will be created or linked on save." : Model.FloorPlan.LocationPath)</p>
        </div>
    </form>
</section>

<div data-floor-plan-workspace data-floor-plan-id="@Model.FloorPlan.FloorPlanID">
    @if (!Model.Floors.Any())
    {
        <section class="empty-panel">
        <h2>No floors yet</h2>
        <p>Add a floor to start arranging linked locations.</p>
        <div class="floor-plan-tool-card mt-3">
            <h3>Add floor</h3>
            <input asp-for="NewFloor.FloorPlanID" type="hidden" name="FloorPlanID" form="floor-plan-add-floor-form" />
            <input asp-for="NewFloor.SortOrder" type="hidden" name="SortOrder" form="floor-plan-add-floor-form" />
            <div class="row g-2 align-items-end">
                <div class="col-md-4">
                    <label class="form-label">New floor</label>
                    <input asp-for="NewFloor.Name" class="form-control form-control-sm" name="Name" form="floor-plan-add-floor-form" />
                </div>
                <div class="col-md-2">
                    <label class="form-label">Width</label>
                    <input asp-for="NewFloor.GridWidth" class="form-control form-control-sm" name="GridWidth" min="8" max="80" form="floor-plan-add-floor-form" />
                </div>
                <div class="col-md-2">
                    <label class="form-label">Height</label>
                    <input asp-for="NewFloor.GridHeight" class="form-control form-control-sm" name="GridHeight" min="8" max="80" form="floor-plan-add-floor-form" />
                </div>
                <div class="col-md-2">
                    <button class="btn btn-outline-primary btn-sm w-100" type="submit" form="floor-plan-add-floor-form">Add floor</button>
                </div>
            </div>
        </div>
        </section>

        <form id="floor-plan-add-floor-form" asp-action="AddFloor" method="post"></form>
    }
    else
    {
        <form asp-action="SaveLayout" method="post" class="floor-plan-editor" data-floor-plan-editor>
        <input asp-for="FloorPlan.FloorPlanID" type="hidden" />
        <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
        <input asp-for="FloorPlan.ProjectID" type="hidden" />
        <input asp-for="FloorPlan.LocationID" type="hidden" />
        <input asp-for="FloorPlan.Name" type="hidden" />
        <input asp-for="FloorPlan.Description" type="hidden" />

        <section class="floor-plan-editor-toolbar">
            <div>
                <span class="muted">Active floor</span>
                <strong data-current-floor-name>@activeFloor?.Name</strong>
            </div>
            <div class="floor-plan-tabs" role="tablist" aria-label="Floors">
                @foreach (var floor in Model.Floors.OrderBy(x => x.SortOrder).ThenBy(x => x.Name))
                {
                    var isActive = floor.FloorPlanFloorID == activeFloor?.FloorPlanFloorID;
                    <button type="button" class="floor-plan-tab @(isActive ? "active" : string.Empty)" data-floor-tab="@floor.FloorPlanFloorID" data-floor-name="@floor.Name" data-floor-location-id="@floor.LocationID">@floor.Name</button>
                }
            </div>
            <div class="button-row">
                <span class="floor-plan-save-status" data-save-status>Saved</span>
                <a class="btn btn-outline-secondary btn-sm" asp-action="Index" asp-route-projectId="@Model.Project.ProjectID">Back to floor plans</a>
                <button class="btn btn-primary btn-sm" type="submit" data-save-layout-button>Save layout</button>
            </div>
        </section>

        <div class="floor-plan-layout">
            <section class="floor-plan-stage">
                @for (var i = 0; i < Model.Floors.Count; i++)
                {
                    var floor = Model.Floors[i];
                    var isActive = floor.FloorPlanFloorID == activeFloor?.FloorPlanFloorID;
                    var floorBlocks = blocksByFloor.GetValueOrDefault(floor.FloorPlanFloorID) ?? [];
                    var floorTransitions = transitionsByFloor.GetValueOrDefault(floor.FloorPlanFloorID) ?? [];
                    <div class="floor-plan-floor @(isActive ? "active" : string.Empty)" data-floor-panel="@floor.FloorPlanFloorID">
                        <div class="floor-plan-grid-wrap">
                            <div class="floor-plan-grid"
                                 style="--grid-width:@floor.GridWidth;--grid-height:@floor.GridHeight;"
                                 data-floor-grid="@floor.FloorPlanFloorID"
                                 data-grid-width="@floor.GridWidth"
                                 data-grid-height="@floor.GridHeight">
                                @if (!string.IsNullOrWhiteSpace(floor.BackgroundImagePath))
                                {
                                    <img class="floor-plan-background-image @(floor.BackgroundLocked ? "is-locked" : string.Empty)"
                                         src="@floor.BackgroundImagePath"
                                         alt=""
                                         style="--bg-opacity:@CssNumber(floor.BackgroundOpacity);--bg-scale:@CssNumber(floor.BackgroundScale);--bg-offset-x:@CssNumber(floor.BackgroundOffsetX)px;--bg-offset-y:@CssNumber(floor.BackgroundOffsetY)px;"
                                         data-background-image="@floor.FloorPlanFloorID" />
                                }
                                @foreach (var block in floorBlocks)
                                {
                                    var blockIndex = Model.Blocks.FindIndex(x => x.FloorPlanBlockID == block.FloorPlanBlockID);
                                    <button type="button"
                                            class="@BlockClass(block.BlockType)"
                                            style="--x:@block.X;--y:@block.Y;--w:@block.WidthCells;--h:@block.HeightCells;"
                                            data-block="@block.FloorPlanBlockID"
                                            data-block-index="@blockIndex"
                                            data-floor-id="@block.FloorPlanFloorID"
                                            data-location-id="@block.LocationID"
                                            title="@block.LocationPath">
                                        <span class="floor-plan-block-label">@block.DisplayLabel</span>
                                        <span class="floor-plan-resize-handle" data-resize-handle aria-hidden="true"></span>
                                    </button>
                                }
                                @foreach (var transition in floorTransitions)
                                {
                                    var transitionDetails = TransitionDetails(transition);
                                    <div class="floor-plan-transition-marker"
                                         data-transition-marker="@transition.FloorPlanTransitionID"
                                         data-from-location-id="@transition.FromLocationID"
                                         data-to-location-id="@transition.ToLocationID"
                                         title="@transitionDetails"
                                         aria-label="@transitionDetails">
                                        <span aria-hidden="true">x</span>
                                    </div>
                                }
                            </div>
                        </div>
                    </div>
                }
            </section>

            <aside class="floor-plan-side-panel">
                <div class="floor-plan-toolbox" data-toolbox>
                    <div class="floor-plan-toolbox-tabs" role="tablist" aria-label="Floor plan tools">
                        <button type="button" class="floor-plan-toolbox-tab active" id="floor-plan-tool-tab-add" role="tab" aria-selected="true" aria-controls="floor-plan-tool-add" data-toolbox-tab="add">Add block</button>
                        <button type="button" class="floor-plan-toolbox-tab" id="floor-plan-tool-tab-selected" role="tab" aria-selected="false" aria-controls="floor-plan-tool-selected" data-toolbox-tab="selected">Selected block</button>
                        <button type="button" class="floor-plan-toolbox-tab" id="floor-plan-tool-tab-background" role="tab" aria-selected="false" aria-controls="floor-plan-tool-background" data-toolbox-tab="background">Background</button>
                        <button type="button" class="floor-plan-toolbox-tab" id="floor-plan-tool-tab-transitions" role="tab" aria-selected="false" aria-controls="floor-plan-tool-transitions" data-toolbox-tab="transitions">Transitions</button>
                        <button type="button" class="floor-plan-toolbox-tab" id="floor-plan-tool-tab-floors" role="tab" aria-selected="false" aria-controls="floor-plan-tool-floors" data-toolbox-tab="floors">Floors</button>
                    </div>
                    <div class="floor-plan-toolbox-body">
                <section class="floor-plan-tool-card active" id="floor-plan-tool-add" role="tabpanel" aria-labelledby="floor-plan-tool-tab-add" data-toolbox-panel="add">
                    <h2>Add block</h2>
                    <p class="muted">Adds a block to <span data-current-floor-name>@activeFloor?.Name</span>. Use a child Location or create a new room under this floor.</p>
                    <input type="hidden" name="FloorPlanBlockID" value="0" form="floor-plan-add-block-form" />
                    <input type="hidden" name="FloorPlanFloorID" value="@activeFloor?.FloorPlanFloorID" data-add-block-floor-id form="floor-plan-add-block-form" />
                    <input type="hidden" name="X" value="0" form="floor-plan-add-block-form" />
                    <input type="hidden" name="Y" value="0" form="floor-plan-add-block-form" />
                    <input type="hidden" name="WidthCells" value="1" data-add-block-width form="floor-plan-add-block-form" />
                    <input type="hidden" name="HeightCells" value="1" data-add-block-height form="floor-plan-add-block-form" />
                    <div class="floor-plan-choice-row" role="group" aria-label="Add block location mode">
                        <label><input type="radio" name="AddBlockLocationMode" value="Existing" checked form="floor-plan-add-block-form" data-add-block-mode /> Use existing location</label>
                        <label><input type="radio" name="AddBlockLocationMode" value="Create" form="floor-plan-add-block-form" data-add-block-mode /> Create new room/location</label>
                    </div>
                    <div class="mb-2" data-existing-location-panel>
                        <label class="form-label" for="add-block-location">Existing child Location</label>
                        <select id="add-block-location" class="form-select form-select-sm" name="LocationID" form="floor-plan-add-block-form" data-add-block-location>
                            <option value="">Choose a child Location</option>
                            @foreach (var location in Model.Locations)
                            {
                                <option value="@location.LocationID" data-parent-location-id="@location.ParentLocationID">@location.LocationPath</option>
                            }
                        </select>
                    </div>
                    <div class="mb-2 d-none" data-new-location-panel>
                        <label class="form-label" for="add-block-new-location">New room/location name</label>
                        <input id="add-block-new-location" class="form-control form-control-sm" name="NewLocationName" form="floor-plan-add-block-form" />
                    </div>
                    <div class="mb-2">
                        <label class="form-label" for="add-block-type">Block type</label>
                        <select id="add-block-type" class="form-select form-select-sm" name="BlockType" asp-items="Model.BlockTypeOptions" form="floor-plan-add-block-form"></select>
                    </div>
                    <div class="mb-2">
                        <label class="form-label" for="add-block-size-preset">Size preset</label>
                        <select id="add-block-size-preset" class="form-select form-select-sm" data-size-preset>
                            <option value="1x1">Small Room 1 x 1</option>
                            <option value="2x1" selected>Medium Room 2 x 1</option>
                            <option value="2x2">Large Room 2 x 2</option>
                            <option value="1x3">Corridor 1 x 3</option>
                            <option value="3x2">Wide Hall 3 x 2</option>
                        </select>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" for="add-block-label">Optional label override</label>
                        <input id="add-block-label" class="form-control form-control-sm" name="LabelOverride" form="floor-plan-add-block-form" />
                    </div>
                    <button class="btn btn-primary btn-sm w-100" type="submit" form="floor-plan-add-block-form">Add block</button>
                </section>

                <section class="floor-plan-tool-card" id="floor-plan-tool-selected" role="tabpanel" aria-labelledby="floor-plan-tool-tab-selected" data-toolbox-panel="selected" hidden>
                    <h2>Selected block</h2>
                    <p class="muted" data-no-selection>Select a block on the grid to edit its details.</p>
                    <div class="floor-plan-overlap-warning d-none" data-overlap-warning>Some blocks overlap on this floor.</div>

                    @for (var i = 0; i < Model.Blocks.Count; i++)
                    {
                        <div class="floor-plan-block-editor d-none" data-block-editor="@Model.Blocks[i].FloorPlanBlockID">
                            <input asp-for="Blocks[i].FloorPlanBlockID" type="hidden" />
                            <input asp-for="Blocks[i].FloorPlanFloorID" type="hidden" data-block-field="floor" />
                            <input asp-for="Blocks[i].LocationName" type="hidden" />
                            <input asp-for="Blocks[i].LocationPath" type="hidden" />
                            <div class="mb-2">
                                <label class="form-label">Location</label>
                                <select asp-for="Blocks[i].LocationID" asp-items="Model.LocationOptions" class="form-select form-select-sm" data-block-field="location"></select>
                            </div>
                            <div class="mb-2">
                                <label class="form-label">Type</label>
                                <select asp-for="Blocks[i].BlockType" asp-items="Model.BlockTypeOptions" class="form-select form-select-sm" data-block-field="type"></select>
                            </div>
                            <div class="row g-2">
                                <div class="col-6">
                                    <label class="form-label">X</label>
                                    <input asp-for="Blocks[i].X" class="form-control form-control-sm" min="0" max="79" data-block-field="x" />
                                </div>
                                <div class="col-6">
                                    <label class="form-label">Y</label>
                                    <input asp-for="Blocks[i].Y" class="form-control form-control-sm" min="0" max="79" data-block-field="y" />
                                </div>
                                <div class="col-6">
                                    <label class="form-label">Width</label>
                                    <input asp-for="Blocks[i].WidthCells" class="form-control form-control-sm" min="1" max="80" data-block-field="w" />
                                </div>
                                <div class="col-6">
                                    <label class="form-label">Height</label>
                                    <input asp-for="Blocks[i].HeightCells" class="form-control form-control-sm" min="1" max="80" data-block-field="h" />
                                </div>
                            </div>
                            <div class="mt-2">
                                <label class="form-label">Label override</label>
                                <input asp-for="Blocks[i].LabelOverride" class="form-control form-control-sm" />
                            </div>
                            <div class="mt-2">
                                <label class="form-label">Notes</label>
                                <textarea asp-for="Blocks[i].Notes" class="form-control form-control-sm" rows="3"></textarea>
                            </div>
                            <div class="button-row mt-3">
                                <button class="btn btn-outline-danger btn-sm"
                                        type="button"
                                        data-bs-toggle="modal"
                                        data-bs-target="#delete-block-@Model.Blocks[i].FloorPlanBlockID">Delete block</button>
                            </div>
                        </div>
                    }
                </section>

                <section class="floor-plan-tool-card" id="floor-plan-tool-background" role="tabpanel" aria-labelledby="floor-plan-tool-tab-background" data-toolbox-panel="background" hidden>
                    <h2>Background</h2>
                    <p class="muted">Settings affect only <span data-current-floor-name>@activeFloor?.Name</span>.</p>
                    @for (var i = 0; i < Model.Floors.Count; i++)
                    {
                        var floor = Model.Floors[i];
                        var isActive = floor.FloorPlanFloorID == activeFloor?.FloorPlanFloorID;
                        <div class="floor-plan-background-editor @(isActive ? string.Empty : "d-none")" data-background-editor="@floor.FloorPlanFloorID">
                            @if (string.IsNullOrWhiteSpace(floor.BackgroundImagePath))
                            {
                                <p class="muted">Upload a map, sketch, or floor-plan image to trace over. The image sits behind the grid and blocks.</p>
                                <div class="mb-3">
                                    <label class="form-label" for="background-image-@floor.FloorPlanFloorID">Background image</label>
                                    <input id="background-image-@floor.FloorPlanFloorID"
                                           class="form-control form-control-sm"
                                           type="file"
                                           name="backgroundImage"
                                           accept=".png,.jpg,.jpeg,.webp,image/png,image/jpeg,image/webp"
                                           form="floor-plan-background-upload-@floor.FloorPlanFloorID" />
                                </div>
                                <button class="btn btn-primary btn-sm w-100" type="submit" form="floor-plan-background-upload-@floor.FloorPlanFloorID">Upload background</button>
                            }
                            else
                            {
                                <p class="floor-plan-background-file">Background: <strong>@floor.BackgroundImageOriginalFileName</strong></p>
                                <div class="mb-2">
                                    <label class="form-label" for="background-opacity-@floor.FloorPlanFloorID">Opacity</label>
                                    <div class="floor-plan-background-range">
                                        <input id="background-opacity-@floor.FloorPlanFloorID"
                                               class="form-range"
                                               type="range"
                                               name="BackgroundOpacity"
                                               min="0.05"
                                               max="1"
                                               step="0.05"
                                               value="@CssNumber(floor.BackgroundOpacity)"
                                               data-background-field="opacity"
                                               data-background-floor="@floor.FloorPlanFloorID"
                                               form="floor-plan-background-settings-@floor.FloorPlanFloorID" />
                                        <span data-background-opacity-value="@floor.FloorPlanFloorID">@CssNumber(floor.BackgroundOpacity)</span>
                                    </div>
                                </div>
                                <div class="row g-2">
                                    <div class="col-6">
                                        <label class="form-label" for="background-scale-@floor.FloorPlanFloorID">Scale</label>
                                        <input id="background-scale-@floor.FloorPlanFloorID"
                                               class="form-control form-control-sm"
                                               type="number"
                                               name="BackgroundScale"
                                               min="0.1"
                                               max="5"
                                               step="0.05"
                                               value="@CssNumber(floor.BackgroundScale)"
                                               data-background-field="scale"
                                               data-background-floor="@floor.FloorPlanFloorID"
                                               form="floor-plan-background-settings-@floor.FloorPlanFloorID" />
                                    </div>
                                    <div class="col-6">
                                        <label class="form-label" for="background-offset-x-@floor.FloorPlanFloorID">Offset X</label>
                                        <input id="background-offset-x-@floor.FloorPlanFloorID"
                                               class="form-control form-control-sm"
                                               type="number"
                                               name="BackgroundOffsetX"
                                               min="-10000"
                                               max="10000"
                                               step="1"
                                               value="@CssNumber(floor.BackgroundOffsetX)"
                                               data-background-field="offsetX"
                                               data-background-floor="@floor.FloorPlanFloorID"
                                               form="floor-plan-background-settings-@floor.FloorPlanFloorID" />
                                    </div>
                                    <div class="col-6">
                                        <label class="form-label" for="background-offset-y-@floor.FloorPlanFloorID">Offset Y</label>
                                        <input id="background-offset-y-@floor.FloorPlanFloorID"
                                               class="form-control form-control-sm"
                                               type="number"
                                               name="BackgroundOffsetY"
                                               min="-10000"
                                               max="10000"
                                               step="1"
                                               value="@CssNumber(floor.BackgroundOffsetY)"
                                               data-background-field="offsetY"
                                               data-background-floor="@floor.FloorPlanFloorID"
                                               form="floor-plan-background-settings-@floor.FloorPlanFloorID" />
                                    </div>
                                    <div class="col-6 d-flex align-items-end">
                                        <label class="floor-plan-checkbox">
                                            <input type="checkbox"
                                                   name="BackgroundLocked"
                                                   value="true"
                                                   @(floor.BackgroundLocked ? "checked" : string.Empty)
                                                   data-background-field="locked"
                                                   data-background-floor="@floor.FloorPlanFloorID"
                                                   form="floor-plan-background-settings-@floor.FloorPlanFloorID" />
                                            Locked
                                        </label>
                                    </div>
                                </div>
                                <div class="button-row mt-3">
                                    <button class="btn btn-outline-secondary btn-sm" type="submit" form="floor-plan-background-reset-@floor.FloorPlanFloorID">Reset position</button>
                                    <button class="btn btn-outline-danger btn-sm" type="button" data-bs-toggle="modal" data-bs-target="#remove-background-@floor.FloorPlanFloorID">Remove background</button>
                                </div>
                            }
                        </div>
                    }
                </section>

                <section class="floor-plan-tool-card" id="floor-plan-tool-transitions" role="tabpanel" aria-labelledby="floor-plan-tool-tab-transitions" data-toolbox-panel="transitions" hidden>
                    <h2>Transitions</h2>
                    <p class="muted">Create doors, archways, stairs, and other movement paths for <span data-current-floor-name>@activeFloor?.Name</span>.</p>
                    @foreach (var floor in Model.Floors)
                    {
                        var isActive = floor.FloorPlanFloorID == activeFloor?.FloorPlanFloorID;
                        var floorBlocks = blocksByFloor.GetValueOrDefault(floor.FloorPlanFloorID) ?? [];
                        var floorLocationOptions = floorBlocks
                            .Where(x => x.LocationID.HasValue)
                            .GroupBy(x => x.LocationID!.Value)
                            .Select(x => x.First())
                            .OrderBy(x => x.LocationName)
                            .ToList();
                        var floorTransitions = transitionsByFloor.GetValueOrDefault(floor.FloorPlanFloorID) ?? [];
                        <div class="floor-plan-transition-editor @(isActive ? string.Empty : "d-none")" data-transition-editor="@floor.FloorPlanFloorID">
                            <div class="accordion floor-plan-transition-accordion" id="transition-accordion-@floor.FloorPlanFloorID">
                                <div class="accordion-item">
                                    <h3 class="accordion-header" id="transition-create-heading-@floor.FloorPlanFloorID">
                                        <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#transition-create-@floor.FloorPlanFloorID" aria-expanded="true" aria-controls="transition-create-@floor.FloorPlanFloorID">
                                            Create transition
                                        </button>
                                    </h3>
                                    <div id="transition-create-@floor.FloorPlanFloorID" class="accordion-collapse collapse show" aria-labelledby="transition-create-heading-@floor.FloorPlanFloorID" data-bs-parent="#transition-accordion-@floor.FloorPlanFloorID">
                                        <div class="accordion-body">
                                            @if (floorLocationOptions.Count < 2)
                                            {
                                                <p class="muted mb-0">Add at least two placed Locations on this floor before creating a transition.</p>
                                            }
                                            else
                                            {
                                                <input type="hidden" name="FloorPlanTransitionID" value="0" form="floor-plan-transition-add-@floor.FloorPlanFloorID" />
                                                <input type="hidden" name="FloorPlanFloorID" value="@floor.FloorPlanFloorID" form="floor-plan-transition-add-@floor.FloorPlanFloorID" />
                                                <div class="mb-2">
                                                    <label class="form-label" for="transition-from-@floor.FloorPlanFloorID">From Location</label>
                                                    <select id="transition-from-@floor.FloorPlanFloorID" class="form-select form-select-sm" name="FromLocationID" form="floor-plan-transition-add-@floor.FloorPlanFloorID">
                                                        <option value="">Choose a Location</option>
                                                        @foreach (var location in floorLocationOptions)
                                                        {
                                                            <option value="@location.LocationID">@location.LocationPath</option>
                                                        }
                                                    </select>
                                                </div>
                                                <div class="mb-2">
                                                    <label class="form-label" for="transition-to-@floor.FloorPlanFloorID">To Location</label>
                                                    <select id="transition-to-@floor.FloorPlanFloorID" class="form-select form-select-sm" name="ToLocationID" form="floor-plan-transition-add-@floor.FloorPlanFloorID">
                                                        <option value="">Choose a Location</option>
                                                        @foreach (var location in floorLocationOptions)
                                                        {
                                                            <option value="@location.LocationID">@location.LocationPath</option>
                                                        }
                                                    </select>
                                                </div>
                                                <div class="mb-2">
                                                    <label class="form-label" for="transition-type-@floor.FloorPlanFloorID">Transition Type</label>
                                                    <select id="transition-type-@floor.FloorPlanFloorID" class="form-select form-select-sm" name="TransitionType" asp-items="Model.TransitionTypeOptions" form="floor-plan-transition-add-@floor.FloorPlanFloorID"></select>
                                                </div>
                                                <div class="mb-2">
                                                    <label class="form-label" for="transition-label-@floor.FloorPlanFloorID">Display Label</label>
                                                    <input id="transition-label-@floor.FloorPlanFloorID" class="form-control form-control-sm" name="DisplayLabel" form="floor-plan-transition-add-@floor.FloorPlanFloorID" />
                                                </div>
                                                <div class="mb-2">
                                                    <label class="form-label" for="transition-notes-@floor.FloorPlanFloorID">Notes</label>
                                                    <textarea id="transition-notes-@floor.FloorPlanFloorID" class="form-control form-control-sm" name="Notes" rows="2" form="floor-plan-transition-add-@floor.FloorPlanFloorID"></textarea>
                                                </div>
                                                <label class="floor-plan-checkbox">
                                                    <input type="checkbox" name="IsLocked" value="true" form="floor-plan-transition-add-@floor.FloorPlanFloorID" />
                                                    Locked
                                                </label>
                                                <button class="btn btn-primary btn-sm w-100 mt-2" type="submit" form="floor-plan-transition-add-@floor.FloorPlanFloorID">Create transition</button>
                                            }
                                        </div>
                                    </div>
                                </div>
                                <div class="accordion-item">
                                    <h3 class="accordion-header" id="transition-existing-heading-@floor.FloorPlanFloorID">
                                        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#transition-existing-@floor.FloorPlanFloorID" aria-expanded="false" aria-controls="transition-existing-@floor.FloorPlanFloorID">
                                            Existing transitions
                                        </button>
                                    </h3>
                                    <div id="transition-existing-@floor.FloorPlanFloorID" class="accordion-collapse collapse" aria-labelledby="transition-existing-heading-@floor.FloorPlanFloorID" data-bs-parent="#transition-accordion-@floor.FloorPlanFloorID">
                                        <div class="accordion-body">
                                            @if (!floorTransitions.Any())
                                            {
                                                <p class="muted mb-0">No transitions on this floor yet.</p>
                                            }
                                            else
                                            {
                                                <div class="floor-plan-transition-list">
                                                    @foreach (var transition in floorTransitions)
                                                    {
                                                        <article class="floor-plan-transition-item">
                                                            <div>
                                                                <strong>@transition.FromLocationName -> @transition.ToLocationName</strong>
                                                                <span>@transition.TransitionType</span>
                                                                @if (!string.IsNullOrWhiteSpace(transition.DisplayLabel))
                                                                {
                                                                    <span>@transition.DisplayLabel</span>
                                                                }
                                                            </div>
                                                            <div class="button-row">
                                                                <button class="btn btn-outline-secondary btn-sm" type="button" data-bs-toggle="modal" data-bs-target="#edit-transition-@transition.FloorPlanTransitionID">Edit</button>
                                                                <button class="btn btn-outline-danger btn-sm" type="button" data-bs-toggle="modal" data-bs-target="#delete-transition-@transition.FloorPlanTransitionID">Delete</button>
                                                            </div>
                                                        </article>
                                                    }
                                                </div>
                                            }
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    }
                </section>

                <section class="floor-plan-tool-card" id="floor-plan-tool-floors" role="tabpanel" aria-labelledby="floor-plan-tool-tab-floors" data-toolbox-panel="floors" hidden>
                    <h2>Floors</h2>
                    <div class="floor-plan-tool-subsection">
                        <h3>Add floor</h3>
                        <input asp-for="NewFloor.FloorPlanID" type="hidden" name="FloorPlanID" form="floor-plan-add-floor-form" />
                        <input asp-for="NewFloor.SortOrder" type="hidden" name="SortOrder" form="floor-plan-add-floor-form" />
                        <div class="mb-2">
                            <label class="form-label">New floor</label>
                            <input asp-for="NewFloor.Name" class="form-control form-control-sm" name="Name" form="floor-plan-add-floor-form" />
                        </div>
                        <div class="row g-2">
                            <div class="col-6">
                                <label class="form-label">Width</label>
                                <input asp-for="NewFloor.GridWidth" class="form-control form-control-sm" name="GridWidth" min="8" max="80" form="floor-plan-add-floor-form" />
                            </div>
                            <div class="col-6">
                                <label class="form-label">Height</label>
                                <input asp-for="NewFloor.GridHeight" class="form-control form-control-sm" name="GridHeight" min="8" max="80" form="floor-plan-add-floor-form" />
                            </div>
                        </div>
                        <button class="btn btn-outline-primary btn-sm w-100 mt-2" type="submit" form="floor-plan-add-floor-form">Add floor</button>
                    </div>
                    <div class="floor-plan-tool-subsection">
                        <h3>Current floor</h3>
                        @for (var i = 0; i < Model.Floors.Count; i++)
                        {
                            var floor = Model.Floors[i];
                            var isActive = floor.FloorPlanFloorID == activeFloor?.FloorPlanFloorID;
                            <div class="floor-plan-floor-editor @(isActive ? string.Empty : "d-none")" data-floor-editor="@floor.FloorPlanFloorID">
                                <input asp-for="Floors[i].FloorPlanFloorID" type="hidden" />
                                <input asp-for="Floors[i].FloorPlanID" type="hidden" />
                                <input asp-for="Floors[i].SortOrder" type="hidden" />
                                <input asp-for="Floors[i].LocationID" type="hidden" />
                                <div class="mb-2">
                                    <label class="form-label">Floor name</label>
                                    <input asp-for="Floors[i].Name" class="form-control form-control-sm" />
                                </div>
                                <p class="muted">Location: @(string.IsNullOrWhiteSpace(floor.LocationPath) ? "A child Location will be created or linked on save." : floor.LocationPath)</p>
                                <div class="row g-2">
                                    <div class="col-6">
                                        <label class="form-label">Grid width</label>
                                        <input asp-for="Floors[i].GridWidth" class="form-control form-control-sm" min="8" max="80" data-floor-width="@floor.FloorPlanFloorID" />
                                    </div>
                                    <div class="col-6">
                                        <label class="form-label">Grid height</label>
                                        <input asp-for="Floors[i].GridHeight" class="form-control form-control-sm" min="8" max="80" data-floor-height="@floor.FloorPlanFloorID" />
                                    </div>
                                </div>
                                <button class="btn btn-outline-danger btn-sm w-100 mt-2"
                                        type="button"
                                        data-bs-toggle="modal"
                                        data-bs-target="#delete-floor-@floor.FloorPlanFloorID">Delete floor</button>
                            </div>
                        }
                    </div>
                </section>
                    </div>
                </div>
            </aside>
        </div>

        <div class="button-row mt-3">
            <button class="btn btn-primary" type="submit" data-save-layout-button>Save layout</button>
        </div>
        </form>

        <form id="floor-plan-add-block-form" asp-action="AddBlock" method="post">
        <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
        </form>

        <form id="floor-plan-add-floor-form" asp-action="AddFloor" method="post"></form>

        @foreach (var floor in Model.Floors)
        {
        <form id="floor-plan-background-upload-@floor.FloorPlanFloorID" asp-action="UploadBackground" method="post" enctype="multipart/form-data">
            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
            <input type="hidden" name="floorPlanFloorId" value="@floor.FloorPlanFloorID" />
        </form>

        <form id="floor-plan-background-settings-@floor.FloorPlanFloorID" asp-action="SaveBackgroundSettings" method="post" data-background-settings-form="@floor.FloorPlanFloorID">
            <input type="hidden" name="FloorPlanID" value="@Model.FloorPlan.FloorPlanID" />
            <input type="hidden" name="FloorPlanFloorID" value="@floor.FloorPlanFloorID" />
        </form>

        <form id="floor-plan-background-reset-@floor.FloorPlanFloorID" asp-action="ResetBackground" method="post">
            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
            <input type="hidden" name="floorPlanFloorId" value="@floor.FloorPlanFloorID" />
        </form>

        <form id="floor-plan-transition-add-@floor.FloorPlanFloorID" asp-action="SaveTransition" method="post">
            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
        </form>
        }

        @foreach (var floor in Model.Floors)
        {
        var placedBlockCount = Model.Blocks.Count(x => x.FloorPlanFloorID == floor.FloorPlanFloorID);
        <div class="modal fade" id="delete-floor-@floor.FloorPlanFloorID" tabindex="-1" aria-labelledby="delete-floor-title-@floor.FloorPlanFloorID" aria-hidden="true">
            <div class="modal-dialog modal-dialog-centered">
                <div class="modal-content plotline-confirm-modal">
                    <div class="modal-header">
                        <h2 class="modal-title fs-5" id="delete-floor-title-@floor.FloorPlanFloorID">Delete floor?</h2>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <div class="modal-body">
                        <p>Delete <strong>@floor.Name</strong>?</p>
                        <p>This deletes @placedBlockCount placed block(s) on this floor. Linked Locations will not be deleted.</p>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                        <form asp-action="DeleteFloor" method="post" data-no-delete-confirm="true">
                            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
                            <input type="hidden" name="floorPlanFloorId" value="@floor.FloorPlanFloorID" />
                            <button class="btn btn-danger" type="submit">Delete floor</button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        }

        @foreach (var floor in Model.Floors.Where(x => !string.IsNullOrWhiteSpace(x.BackgroundImagePath)))
        {
        <div class="modal fade" id="remove-background-@floor.FloorPlanFloorID" tabindex="-1" aria-labelledby="remove-background-title-@floor.FloorPlanFloorID" aria-hidden="true">
            <div class="modal-dialog modal-dialog-centered">
                <div class="modal-content plotline-confirm-modal">
                    <div class="modal-header">
                        <h2 class="modal-title fs-5" id="remove-background-title-@floor.FloorPlanFloorID">Remove background?</h2>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <div class="modal-body">
                        <p>Remove the background image for <strong>@floor.Name</strong>?</p>
                        <p>This removes only the tracing image from this floor. Blocks and linked Locations will not be deleted.</p>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                        <form asp-action="RemoveBackground" method="post" data-no-delete-confirm="true">
                            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
                            <input type="hidden" name="floorPlanFloorId" value="@floor.FloorPlanFloorID" />
                            <button class="btn btn-danger" type="submit">Remove background</button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        }

        @foreach (var transition in Model.Transitions)
        {
        var transitionFloorBlocks = blocksByFloor.GetValueOrDefault(transition.FloorPlanFloorID) ?? [];
        var transitionLocationOptions = transitionFloorBlocks
            .Where(x => x.LocationID.HasValue)
            .GroupBy(x => x.LocationID!.Value)
            .Select(x => x.First())
            .OrderBy(x => x.LocationName)
            .ToList();
        <div class="modal fade" id="edit-transition-@transition.FloorPlanTransitionID" tabindex="-1" aria-labelledby="edit-transition-title-@transition.FloorPlanTransitionID" aria-hidden="true">
            <div class="modal-dialog modal-dialog-centered">
                <div class="modal-content">
                    <div class="modal-header">
                        <h2 class="modal-title fs-5" id="edit-transition-title-@transition.FloorPlanTransitionID">Edit transition</h2>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <form asp-action="SaveTransition" method="post">
                        <div class="modal-body">
                            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
                            <input type="hidden" name="FloorPlanTransitionID" value="@transition.FloorPlanTransitionID" />
                            <input type="hidden" name="FloorPlanFloorID" value="@transition.FloorPlanFloorID" />
                            <div class="mb-2">
                                <label class="form-label">From Location</label>
                                <select class="form-select form-select-sm" name="FromLocationID">
                                    @foreach (var location in transitionLocationOptions)
                                    {
                                        <option value="@location.LocationID" selected="@(location.LocationID == transition.FromLocationID)">@location.LocationPath</option>
                                    }
                                </select>
                            </div>
                            <div class="mb-2">
                                <label class="form-label">To Location</label>
                                <select class="form-select form-select-sm" name="ToLocationID">
                                    @foreach (var location in transitionLocationOptions)
                                    {
                                        <option value="@location.LocationID" selected="@(location.LocationID == transition.ToLocationID)">@location.LocationPath</option>
                                    }
                                </select>
                            </div>
                            <div class="mb-2">
                                <label class="form-label">Transition Type</label>
                                <select class="form-select form-select-sm" name="TransitionType">
                                    @foreach (var option in Model.TransitionTypeOptions)
                                    {
                                        <option value="@option.Value" selected="@(option.Value == transition.TransitionType)">@option.Text</option>
                                    }
                                </select>
                            </div>
                            <div class="mb-2">
                                <label class="form-label">Display Label</label>
                                <input class="form-control form-control-sm" name="DisplayLabel" value="@transition.DisplayLabel" />
                            </div>
                            <div class="mb-2">
                                <label class="form-label">Notes</label>
                                <textarea class="form-control form-control-sm" name="Notes" rows="3">@transition.Notes</textarea>
                            </div>
                            <label class="floor-plan-checkbox">
                                <input type="checkbox" name="IsLocked" value="true" @(transition.IsLocked ? "checked" : string.Empty) />
                                Locked
                            </label>
                        </div>
                        <div class="modal-footer">
                            <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                            <button class="btn btn-primary" type="submit">Save transition</button>
                        </div>
                    </form>
                </div>
            </div>
        </div>

        <div class="modal fade" id="delete-transition-@transition.FloorPlanTransitionID" tabindex="-1" aria-labelledby="delete-transition-title-@transition.FloorPlanTransitionID" aria-hidden="true">
            <div class="modal-dialog modal-dialog-centered">
                <div class="modal-content plotline-confirm-modal">
                    <div class="modal-header">
                        <h2 class="modal-title fs-5" id="delete-transition-title-@transition.FloorPlanTransitionID">Delete transition?</h2>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <div class="modal-body">
                        <p>Delete the <strong>@transition.TransitionType</strong> transition from <strong>@transition.FromLocationName</strong> to <strong>@transition.ToLocationName</strong>?</p>
                        <p>Locations and blocks will not be deleted.</p>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                        <form asp-action="DeleteTransition" method="post" data-no-delete-confirm="true">
                            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
                            <input type="hidden" name="floorPlanTransitionId" value="@transition.FloorPlanTransitionID" />
                            <button class="btn btn-danger" type="submit">Delete transition</button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        }

        @foreach (var block in Model.Blocks)
        {
        <div class="modal fade" id="delete-block-@block.FloorPlanBlockID" tabindex="-1" aria-labelledby="delete-block-title-@block.FloorPlanBlockID" aria-hidden="true">
            <div class="modal-dialog modal-dialog-centered">
                <div class="modal-content plotline-confirm-modal">
                    <div class="modal-header">
                        <h2 class="modal-title fs-5" id="delete-block-title-@block.FloorPlanBlockID">Delete placed block?</h2>
                        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                    </div>
                    <div class="modal-body">
                        <p>Remove the placed block for <strong>@block.DisplayLabel</strong>?</p>
                        <p>Only this block is removed from the floor plan. The linked Location will not be deleted.</p>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
                        <form asp-action="DeleteBlock" method="post" data-no-delete-confirm="true">
                            <input type="hidden" name="floorPlanId" value="@Model.FloorPlan.FloorPlanID" />
                            <input type="hidden" name="floorPlanBlockId" value="@block.FloorPlanBlockID" />
                            <button class="btn btn-danger" type="submit">Delete block</button>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        }
    }
</div>

@section Scripts {
    <partial name="_ValidationScriptsPartial" />
    <script>
        window.initializeFloorPlanEditor = (options = {}) => {
            const editor = document.querySelector("[data-floor-plan-editor]");
            if (!editor) return;
            if (editor.dataset.floorPlanInitialized === "true") return;
            editor.dataset.floorPlanInitialized = "true";
            const workspace = editor.closest("[data-floor-plan-workspace]");

            const tabs = [...editor.querySelectorAll("[data-floor-tab]")];
            const panels = [...editor.querySelectorAll("[data-floor-panel]")];
            const floorEditors = [...editor.querySelectorAll("[data-floor-editor]")];
            const backgroundEditors = [...editor.querySelectorAll("[data-background-editor]")];
            const transitionEditors = [...editor.querySelectorAll("[data-transition-editor]")];
            let blocks = [...editor.querySelectorAll("[data-block]")];
            const noSelection = editor.querySelector("[data-no-selection]");
            const warning = editor.querySelector("[data-overlap-warning]");
            const addBlockFloor = document.querySelector("[data-add-block-floor-id]");
            const addBlockFloorNames = [...document.querySelectorAll("[data-current-floor-name]")];
            const addBlockLocation = document.querySelector("[data-add-block-location]");
            const addBlockModes = [...document.querySelectorAll("[data-add-block-mode]")];
            const addBlockType = document.querySelector("#add-block-type");
            const existingLocationPanel = document.querySelector("[data-existing-location-panel]");
            const newLocationPanel = document.querySelector("[data-new-location-panel]");
            const sizePreset = document.querySelector("[data-size-preset]");
            const addBlockWidth = document.querySelector("[data-add-block-width]");
            const addBlockHeight = document.querySelector("[data-add-block-height]");
            const addBlockForm = document.querySelector("#floor-plan-add-block-form");
            const toolboxTabs = [...editor.querySelectorAll("[data-toolbox-tab]")];
            const toolboxPanels = [...editor.querySelectorAll("[data-toolbox-panel]")];
            const saveStatus = editor.querySelector("[data-save-status]");
            const saveButtons = [...editor.querySelectorAll("[data-save-layout-button]")];
            const initialSelectedBlockId = options.selectedBlockId || "@selectedBlockId";
            const saveStatusText = {
                saved: "Saved",
                dirty: "Unsaved changes",
                saving: "Saving...",
                failed: "Save failed"
            };
            const sizePresets = {
                Room: [
                    ["1x1", "Small Room 1 x 1"],
                    ["2x1", "Medium Room 2 x 1"],
                    ["2x2", "Large Room 2 x 2"],
                    ["3x1", "Long Room 3 x 1"],
                    ["3x2", "Grand Room 3 x 2"]
                ],
                Corridor: [
                    ["1x2", "Short Corridor 1 x 2"],
                    ["1x4", "Long Corridor 1 x 4"],
                    ["2x3", "Wide Corridor 2 x 3"],
                    ["4x1", "Horizontal Corridor 4 x 1"],
                    ["5x1", "Gallery 5 x 1"]
                ],
                OpenSpace: [
                    ["4x4", "Courtyard 4 x 4"],
                    ["6x5", "Large Courtyard 6 x 5"],
                    ["6x4", "Garden Area 6 x 4"],
                    ["2x2", "Lightwell 2 x 2"]
                ],
                Exterior: [
                    ["3x3", "Yard 3 x 3"],
                    ["4x2", "Drive 4 x 2"],
                    ["6x4", "Garden 6 x 4"],
                    ["4x1", "Terrace 4 x 1"]
                ],
                Other: [
                    ["1x1", "Small 1 x 1"],
                    ["2x1", "Medium 2 x 1"],
                    ["2x2", "Large 2 x 2"],
                    ["3x2", "Wide 3 x 2"]
                ]
            };
            let selectedBlock = null;
            let pointerState = null;
            let saveTimer = null;
            let saveInFlight = false;
            let saveAgain = false;
            const backgroundTimers = new Map();

            function setToolboxTab(tabName) {
                toolboxTabs.forEach(tab => {
                    const active = tab.dataset.toolboxTab === tabName;
                    tab.classList.toggle("active", active);
                    tab.setAttribute("aria-selected", active ? "true" : "false");
                });
                toolboxPanels.forEach(panel => {
                    const active = panel.dataset.toolboxPanel === tabName;
                    panel.classList.toggle("active", active);
                    panel.hidden = !active;
                });
            }

            function setSaveStatus(state, message) {
                if (!saveStatus) return;
                saveStatus.dataset.saveState = state;
                saveStatus.textContent = message || saveStatusText[state] || state;
            }

            function markDirty() {
                setSaveStatus("dirty");
                window.clearTimeout(saveTimer);
                saveTimer = window.setTimeout(() => saveLayoutAsync(), 1000);
            }

            function workspaceState(overrides = {}) {
                const activePanel = panels.find(panel => panel.classList.contains("active"));
                const gridWrap = activePanel?.querySelector(".floor-plan-grid-wrap");
                const toolboxBody = editor.querySelector(".floor-plan-toolbox-body");
                return {
                    activeFloorId: activePanel?.dataset.floorPanel || tabs.find(tab => tab.classList.contains("active"))?.dataset.floorTab || "",
                    activeToolboxTab: toolboxTabs.find(tab => tab.classList.contains("active"))?.dataset.toolboxTab || "add",
                    selectedBlockId: selectedBlock?.dataset.block || "",
                    pageX: window.scrollX,
                    pageY: window.scrollY,
                    gridLeft: gridWrap?.scrollLeft || 0,
                    gridTop: gridWrap?.scrollTop || 0,
                    toolboxTop: toolboxBody?.scrollTop || 0,
                    ...overrides
                };
            }

            function showWorkspaceError(message) {
                setSaveStatus("failed", message || "Save failed");
                let alert = editor.querySelector("[data-workspace-error]");
                if (!alert) {
                    alert = document.createElement("div");
                    alert.className = "alert alert-danger";
                    alert.dataset.workspaceError = "true";
                    editor.prepend(alert);
                }
                alert.textContent = message || "Save failed";
            }

            function cleanupModalArtifacts() {
                document.querySelectorAll(".modal-backdrop").forEach(backdrop => backdrop.remove());
                document.body.classList.remove("modal-open");
                document.body.style.removeProperty("overflow");
                document.body.style.removeProperty("padding-right");
            }

            function restoreWorkspaceState(state) {
                if (state.activeFloorId) {
                    setActiveFloor(String(state.activeFloorId));
                }
                if (!panels.some(panel => panel.classList.contains("active")) && tabs[0]) {
                    setActiveFloor(tabs[0].dataset.floorTab);
                }
                if (state.activeToolboxTab) {
                    setToolboxTab(state.activeToolboxTab);
                }
                if (state.selectedBlockId) {
                    const block = blocks.find(item => item.dataset.block === String(state.selectedBlockId));
                    if (block) {
                        selectBlock(block, { showEditor: state.activeToolboxTab === "selected" });
                    }
                }

                const activePanel = panels.find(panel => panel.classList.contains("active"));
                const gridWrap = activePanel?.querySelector(".floor-plan-grid-wrap");
                const toolboxBody = editor.querySelector(".floor-plan-toolbox-body");
                if (gridWrap) {
                    gridWrap.scrollLeft = state.gridLeft || 0;
                    gridWrap.scrollTop = state.gridTop || 0;
                }
                if (toolboxBody) {
                    toolboxBody.scrollTop = state.toolboxTop || 0;
                }
                window.scrollTo(state.pageX || 0, state.pageY || 0);
                document.documentElement.scrollTop = state.pageY || 0;
                document.body.scrollTop = state.pageY || 0;
            }

            async function refreshWorkspaceAsync(state) {
                const floorPlanId = workspace?.dataset.floorPlanId;
                if (!workspace || !floorPlanId) return;

                const response = await fetch(`/FloorPlans/Edit/${floorPlanId}`, {
                    method: "GET",
                    headers: { "X-Requested-With": "XMLHttpRequest" },
                    credentials: "same-origin"
                });
                const html = await response.text();
                if (!response.ok) {
                    throw new Error("The floor plan workspace could not be refreshed.");
                }

                const doc = new DOMParser().parseFromString(html, "text/html");
                const nextWorkspace = doc.querySelector("[data-floor-plan-workspace]");
                if (!nextWorkspace) {
                    throw new Error("The refreshed floor plan workspace was not found.");
                }

                cleanupModalArtifacts();
                workspace.replaceWith(nextWorkspace);
                window.initializeFloorPlanEditor({
                    activeFloorId: state.activeFloorId,
                    activeToolboxTab: state.activeToolboxTab,
                    selectedBlockId: state.selectedBlockId
                });
                const nextEditor = document.querySelector("[data-floor-plan-editor]");
                const nextStatus = nextEditor?.querySelector("[data-save-status]");
                if (nextStatus) {
                    nextStatus.dataset.saveState = "saved";
                    nextStatus.textContent = "Saved";
                }
                window.requestAnimationFrame(() => {
                    const refreshedEditor = document.querySelector("[data-floor-plan-editor]");
                    if (!refreshedEditor) return;
                    refreshedEditor.dispatchEvent(new CustomEvent("floor-plan-restore-state", { detail: state }));
                });
            }

            async function saveLayoutAsync() {
                window.clearTimeout(saveTimer);
                if (saveInFlight) {
                    saveAgain = true;
                    return;
                }

                saveInFlight = true;
                saveButtons.forEach(button => button.disabled = true);
                setSaveStatus("saving");
                try {
                    const response = await fetch(editor.action, {
                        method: "POST",
                        body: new FormData(editor),
                        headers: {
                            "Accept": "application/json",
                            "X-Requested-With": "XMLHttpRequest"
                        },
                        credentials: "same-origin"
                    });
                    const result = await response.json().catch(() => ({}));
                    if (!response.ok || result.ok === false) {
                        throw new Error(result.message || "Unable to save layout.");
                    }

                    setSaveStatus("saved");
                } catch (error) {
                    setSaveStatus("failed", error.message || "Save failed");
                } finally {
                    saveInFlight = false;
                    saveButtons.forEach(button => button.disabled = false);
                    if (saveAgain) {
                        saveAgain = false;
                        markDirty();
                    }
                }
            }

            function updateFloorGrid(floorId) {
                const grid = editor.querySelector(`[data-floor-grid="${floorId}"]`);
                const widthInput = editor.querySelector(`[data-floor-width="${floorId}"]`);
                const heightInput = editor.querySelector(`[data-floor-height="${floorId}"]`);
                if (!grid || !widthInput || !heightInput) return;

                const width = Math.max(8, Math.min(Number(widthInput.value || 24), 80));
                const height = Math.max(8, Math.min(Number(heightInput.value || 16), 80));
                widthInput.value = width;
                heightInput.value = height;
                grid.dataset.gridWidth = width;
                grid.dataset.gridHeight = height;
                grid.style.setProperty("--grid-width", width);
                grid.style.setProperty("--grid-height", height);

                grid.querySelectorAll("[data-block]").forEach(block => writeBlock(block, readBlock(block)));
                checkOverlaps();
            }

            function setActiveFloor(floorId) {
                tabs.forEach(tab => tab.classList.toggle("active", tab.dataset.floorTab === floorId));
                panels.forEach(panel => panel.classList.toggle("active", panel.dataset.floorPanel === floorId));
                floorEditors.forEach(panel => panel.classList.toggle("d-none", panel.dataset.floorEditor !== floorId));
                backgroundEditors.forEach(panel => {
                    const active = panel.dataset.backgroundEditor === floorId;
                    panel.classList.toggle("d-none", !active);
                    panel.hidden = !active;
                });
                transitionEditors.forEach(panel => {
                    const active = panel.dataset.transitionEditor === floorId;
                    panel.classList.toggle("d-none", !active);
                    panel.hidden = !active;
                });
                const activeTab = tabs.find(tab => tab.dataset.floorTab === floorId);
                if (addBlockFloor) addBlockFloor.value = floorId;
                if (activeTab) {
                    addBlockFloorNames.forEach(item => item.textContent = activeTab.dataset.floorName || activeTab.textContent || "the current floor");
                }
                filterAddBlockLocations(activeTab?.dataset.floorLocationId || "");
                checkOverlaps();
            }

            function backgroundFields(floorId) {
                const panel = editor.querySelector(`[data-background-editor="${floorId}"]`);
                return {
                    form: document.querySelector(`[data-background-settings-form="${floorId}"]`),
                    image: editor.querySelector(`[data-background-image="${floorId}"]`),
                    opacity: panel?.querySelector("[data-background-field='opacity']"),
                    scale: panel?.querySelector("[data-background-field='scale']"),
                    offsetX: panel?.querySelector("[data-background-field='offsetX']"),
                    offsetY: panel?.querySelector("[data-background-field='offsetY']"),
                    locked: panel?.querySelector("[data-background-field='locked']"),
                    opacityValue: editor.querySelector(`[data-background-opacity-value="${floorId}"]`)
                };
            }

            function updateBackgroundPreview(floorId) {
                const fields = backgroundFields(floorId);
                if (!fields.image) return;
                const opacity = Number(fields.opacity?.value || 0.35);
                const scale = Number(fields.scale?.value || 1);
                const offsetX = Number(fields.offsetX?.value || 0);
                const offsetY = Number(fields.offsetY?.value || 0);
                fields.image.style.setProperty("--bg-opacity", Math.max(0.05, Math.min(opacity, 1)));
                fields.image.style.setProperty("--bg-scale", Math.max(0.1, Math.min(scale, 5)));
                fields.image.style.setProperty("--bg-offset-x", `${Math.max(-10000, Math.min(offsetX, 10000))}px`);
                fields.image.style.setProperty("--bg-offset-y", `${Math.max(-10000, Math.min(offsetY, 10000))}px`);
                fields.image.classList.toggle("is-locked", fields.locked?.checked !== false);
                if (fields.opacityValue) fields.opacityValue.textContent = fields.opacity?.value || "0.35";
            }

            function markBackgroundDirty(floorId) {
                updateBackgroundPreview(floorId);
                setSaveStatus("dirty");
                window.clearTimeout(backgroundTimers.get(floorId));
                backgroundTimers.set(floorId, window.setTimeout(() => saveBackgroundSettingsAsync(floorId), 1000));
            }

            async function saveBackgroundSettingsAsync(floorId) {
                const fields = backgroundFields(floorId);
                if (!fields.form) return;
                window.clearTimeout(backgroundTimers.get(floorId));
                setSaveStatus("saving");
                try {
                    const response = await fetch(fields.form.action, {
                        method: "POST",
                        body: new FormData(fields.form),
                        headers: {
                            "Accept": "application/json",
                            "X-Requested-With": "XMLHttpRequest"
                        },
                        credentials: "same-origin"
                    });
                    const result = await response.json().catch(() => ({}));
                    if (!response.ok || result.ok === false) {
                        throw new Error(result.message || "Unable to save background settings.");
                    }

                    setSaveStatus("saved");
                } catch (error) {
                    setSaveStatus("failed", error.message || "Save failed");
                }
            }

            function filterAddBlockLocations(floorLocationId) {
                if (!addBlockLocation) return;
                let firstValue = "";
                [...addBlockLocation.options].forEach(option => {
                    if (!option.value) {
                        option.hidden = false;
                        option.disabled = false;
                        return;
                    }
                    const matches = option.dataset.parentLocationId === floorLocationId;
                    option.hidden = !matches;
                    option.disabled = !matches;
                    if (matches && !firstValue) firstValue = option.value;
                });
                if (!addBlockLocation.value || addBlockLocation.selectedOptions[0]?.disabled) {
                    addBlockLocation.value = firstValue;
                }
            }

            function updateAddBlockMode() {
                const selectedMode = addBlockModes.find(input => input.checked)?.value || "Existing";
                const isCreate = selectedMode === "Create";
                existingLocationPanel?.classList.toggle("d-none", isCreate);
                newLocationPanel?.classList.toggle("d-none", !isCreate);
            }

            function attachBlockEvents(block) {
                block.addEventListener("pointerdown", event => {
                    selectBlock(block);
                    const grid = gridFor(block);
                    if (!grid) return;
                    const start = cellFromPointer(grid, event);
                    const current = readBlock(block);
                    const resizing = event.target.matches("[data-resize-handle]");
                    pointerState = { block, grid, start, current, resizing };
                    block.setPointerCapture(event.pointerId);
                    event.preventDefault();
                });
            }

            function appendHidden(panel, name, value, field) {
                const input = document.createElement("input");
                input.type = "hidden";
                input.name = name;
                input.value = value ?? "";
                if (field) input.dataset.blockField = field;
                panel.append(input);
                return input;
            }

            function createBlockEditor(block) {
                const selectedPanel = editor.querySelector("#floor-plan-tool-selected");
                if (!selectedPanel) return null;

                const index = editor.querySelectorAll("[data-block-editor]").length;
                const panel = document.createElement("div");
                panel.className = "floor-plan-block-editor d-none";
                panel.dataset.blockEditor = block.floorPlanBlockID;

                appendHidden(panel, `Blocks[${index}].FloorPlanBlockID`, block.floorPlanBlockID);
                appendHidden(panel, `Blocks[${index}].FloorPlanFloorID`, block.floorPlanFloorID, "floor");
                appendHidden(panel, `Blocks[${index}].LocationName`, block.locationName || "");
                appendHidden(panel, `Blocks[${index}].LocationPath`, block.locationPath || "");

                const locationTemplate = editor.querySelector("[data-block-field='location']");
                const typeTemplate = editor.querySelector("[data-block-field='type']");

                const locationWrap = document.createElement("div");
                locationWrap.className = "mb-2";
                locationWrap.innerHTML = `<label class="form-label">Location</label>`;
                const locationSelect = locationTemplate?.cloneNode(true) || document.createElement("select");
                locationSelect.name = `Blocks[${index}].LocationID`;
                locationSelect.dataset.blockField = "location";
                locationSelect.value = block.locationID || "";
                locationSelect.addEventListener("change", () => {
                    if (!selectedBlock) return;
                    selectedBlock.dataset.locationId = locationSelect.value || "";
                    checkOverlaps();
                    markDirty();
                });
                locationWrap.append(locationSelect);
                panel.append(locationWrap);

                const typeWrap = document.createElement("div");
                typeWrap.className = "mb-2";
                typeWrap.innerHTML = `<label class="form-label">Type</label>`;
                const typeSelect = typeTemplate?.cloneNode(true) || document.createElement("select");
                typeSelect.name = `Blocks[${index}].BlockType`;
                typeSelect.dataset.blockField = "type";
                typeSelect.value = block.blockType || "Room";
                typeSelect.addEventListener("change", () => {
                    if (!selectedBlock) return;
                    selectedBlock.className = selectedBlock.className
                        .split(" ")
                        .filter(name => !name.startsWith("floor-plan-block--"))
                        .concat(`floor-plan-block--${typeSelect.value.toLowerCase()}`)
                        .join(" ");
                    markDirty();
                });
                typeWrap.append(typeSelect);
                panel.append(typeWrap);

                const gridFields = document.createElement("div");
                gridFields.className = "row g-2";
                [
                    ["X", "x", block.x, "X"],
                    ["Y", "y", block.y, "Y"],
                    ["Width", "w", block.widthCells, "WidthCells"],
                    ["Height", "h", block.heightCells, "HeightCells"]
                ].forEach(([label, field, value, property]) => {
                    const wrap = document.createElement("div");
                    wrap.className = "col-6";
                    wrap.innerHTML = `<label class="form-label">${label}</label>`;
                    const input = document.createElement("input");
                    input.className = "form-control form-control-sm";
                    input.type = "number";
                    input.min = field === "x" || field === "y" ? "0" : "1";
                    input.max = field === "x" || field === "y" ? "79" : "80";
                    input.name = `Blocks[${index}].${property}`;
                    input.value = value;
                    input.dataset.blockField = field;
                    const updateBlockField = () => {
                        if (!selectedBlock) return;
                        writeBlock(selectedBlock, readBlock(selectedBlock));
                        markDirty();
                    };
                    input.addEventListener("input", updateBlockField);
                    input.addEventListener("change", updateBlockField);
                    wrap.append(input);
                    gridFields.append(wrap);
                });
                panel.append(gridFields);

                const labelWrap = document.createElement("div");
                labelWrap.className = "mt-2";
                labelWrap.innerHTML = `<label class="form-label">Label override</label>`;
                const labelInput = document.createElement("input");
                labelInput.className = "form-control form-control-sm";
                labelInput.name = `Blocks[${index}].LabelOverride`;
                labelInput.value = block.labelOverride || "";
                labelInput.addEventListener("input", markDirty);
                labelWrap.append(labelInput);
                panel.append(labelWrap);

                const notesWrap = document.createElement("div");
                notesWrap.className = "mt-2";
                notesWrap.innerHTML = `<label class="form-label">Notes</label>`;
                const notesInput = document.createElement("textarea");
                notesInput.className = "form-control form-control-sm";
                notesInput.name = `Blocks[${index}].Notes`;
                notesInput.rows = 3;
                notesInput.value = block.notes || "";
                notesInput.addEventListener("input", markDirty);
                notesWrap.append(notesInput);
                panel.append(notesWrap);

                selectedPanel.append(panel);
                return panel;
            }

            function addBlockToGrid(block) {
                const grid = editor.querySelector(`[data-floor-grid="${block.floorPlanFloorID}"]`);
                if (!grid) return null;

                const button = document.createElement("button");
                button.type = "button";
                button.className = `floor-plan-block floor-plan-block--${(block.blockType || "Room").toLowerCase()}`;
                button.style.setProperty("--x", block.x);
                button.style.setProperty("--y", block.y);
                button.style.setProperty("--w", block.widthCells);
                button.style.setProperty("--h", block.heightCells);
                button.dataset.block = block.floorPlanBlockID;
                button.dataset.blockIndex = blocks.length;
                button.dataset.floorId = block.floorPlanFloorID;
                button.dataset.locationId = block.locationID || "";
                button.title = block.locationPath || "";
                button.innerHTML = `<span class="floor-plan-block-label"></span><span class="floor-plan-resize-handle" data-resize-handle aria-hidden="true"></span>`;
                button.querySelector(".floor-plan-block-label").textContent = block.displayLabel || block.locationName || "New block";
                grid.append(button);

                blocks.push(button);
                attachBlockEvents(button);
                createBlockEditor(block);
                checkOverlaps();
                return button;
            }

            async function addBlockAsync(event) {
                event.preventDefault();
                if (!addBlockForm) return;
                if (document.activeElement instanceof HTMLElement) {
                    document.activeElement.blur();
                }

                const scrollState = workspaceState();
                setSaveStatus("saving");
                try {
                    const response = await fetch(addBlockForm.action, {
                        method: "POST",
                        body: new FormData(addBlockForm),
                        headers: {
                            "Accept": "application/json",
                            "X-Requested-With": "XMLHttpRequest"
                        },
                        credentials: "same-origin"
                    });
                    const result = await response.json().catch(() => ({}));
                    if (!response.ok || result.ok === false || !result.block) {
                        throw new Error(result.message || "Unable to add block.");
                    }

                    scrollState.selectedBlockId = result.block.floorPlanBlockID;
                    await refreshWorkspaceAsync(scrollState);
                } catch (error) {
                    setSaveStatus("failed", error.message || "Save failed");
                }
            }

            function selectBlock(block, options = {}) {
                const showEditor = options.showEditor !== false;
                selectedBlock = block;
                blocks.forEach(item => item.classList.toggle("selected", item === block));
                editor.querySelectorAll("[data-block-editor]").forEach(panel => panel.classList.add("d-none"));
                const panel = editor.querySelector(`[data-block-editor="${block.dataset.block}"]`);
                if (panel) panel.classList.remove("d-none");
                if (noSelection) noSelection.classList.add("d-none");
                if (showEditor) {
                    setToolboxTab("selected");
                }
            }

            function fieldsFor(block) {
                const panel = editor.querySelector(`[data-block-editor="${block.dataset.block}"]`);
                return {
                    panel,
                    floor: panel?.querySelector("[data-block-field='floor']"),
                    x: panel?.querySelector("[data-block-field='x']"),
                    y: panel?.querySelector("[data-block-field='y']"),
                    w: panel?.querySelector("[data-block-field='w']"),
                    h: panel?.querySelector("[data-block-field='h']"),
                    location: panel?.querySelector("[data-block-field='location']"),
                    type: panel?.querySelector("[data-block-field='type']")
                };
            }

            function gridFor(block) {
                return editor.querySelector(`[data-floor-grid="${block.dataset.floorId}"]`);
            }

            function clampBlock(block, values) {
                const grid = gridFor(block);
                const gridWidth = Number(grid?.dataset.gridWidth || 24);
                const gridHeight = Number(grid?.dataset.gridHeight || 16);
                const w = Math.max(1, Math.min(Number(values.w), gridWidth));
                const h = Math.max(1, Math.min(Number(values.h), gridHeight));
                const x = Math.max(0, Math.min(Number(values.x), gridWidth - w));
                const y = Math.max(0, Math.min(Number(values.y), gridHeight - h));
                return { x, y, w, h };
            }

            function readBlock(block) {
                const fields = fieldsFor(block);
                return {
                    x: Number(fields.x?.value || block.style.getPropertyValue("--x") || 0),
                    y: Number(fields.y?.value || block.style.getPropertyValue("--y") || 0),
                    w: Number(fields.w?.value || block.style.getPropertyValue("--w") || 1),
                    h: Number(fields.h?.value || block.style.getPropertyValue("--h") || 1)
                };
            }

            function writeBlock(block, values) {
                const next = clampBlock(block, values);
                block.style.setProperty("--x", next.x);
                block.style.setProperty("--y", next.y);
                block.style.setProperty("--w", next.w);
                block.style.setProperty("--h", next.h);
                const fields = fieldsFor(block);
                if (fields.x) fields.x.value = next.x;
                if (fields.y) fields.y.value = next.y;
                if (fields.w) fields.w.value = next.w;
                if (fields.h) fields.h.value = next.h;
                checkOverlaps();
            }

            function rangesOverlap(aStart, aLength, bStart, bLength) {
                return aStart < bStart + bLength && bStart < aStart + aLength;
            }

            function subtractRange(segments, start, end) {
                return segments.flatMap(segment => {
                    const clippedStart = Math.max(segment.start, start);
                    const clippedEnd = Math.min(segment.end, end);
                    if (clippedStart >= clippedEnd) return [segment];

                    return [
                        { start: segment.start, end: clippedStart },
                        { start: clippedEnd, end: segment.end }
                    ].filter(next => next.end > next.start);
                });
            }

            function renderWallSegment(block, side, start, end, total) {
                if (end <= start || total <= 0) return;

                const segment = document.createElement("span");
                segment.dataset.wallSegment = side;
                segment.className = `floor-plan-wall-segment floor-plan-wall-segment--${side}`;
                segment.style.setProperty("--wall-start", `${(start / total) * 100}%`);
                segment.style.setProperty("--wall-length", `${((end - start) / total) * 100}%`);
                block.append(segment);
            }

            function visibleEdgeSegments(item, visibleBlocks, side) {
                const axisStart = side === "east" || side === "west" ? item.y : item.x;
                const axisLength = side === "east" || side === "west" ? item.h : item.w;
                let segments = [{ start: 0, end: axisLength }];

                visibleBlocks.forEach(other => {
                    if (item === other || !item.block.dataset.locationId || item.block.dataset.locationId !== other.block.dataset.locationId) return;

                    let touches = false;
                    let overlapStart = 0;
                    let overlapEnd = 0;

                    if (side === "east" && item.x + item.w === other.x) {
                        touches = true;
                        overlapStart = Math.max(item.y, other.y) - axisStart;
                        overlapEnd = Math.min(item.y + item.h, other.y + other.h) - axisStart;
                    } else if (side === "west" && other.x + other.w === item.x) {
                        touches = true;
                        overlapStart = Math.max(item.y, other.y) - axisStart;
                        overlapEnd = Math.min(item.y + item.h, other.y + other.h) - axisStart;
                    } else if (side === "south" && item.y + item.h === other.y) {
                        touches = true;
                        overlapStart = Math.max(item.x, other.x) - axisStart;
                        overlapEnd = Math.min(item.x + item.w, other.x + other.w) - axisStart;
                    } else if (side === "north" && other.y + other.h === item.y) {
                        touches = true;
                        overlapStart = Math.max(item.x, other.x) - axisStart;
                        overlapEnd = Math.min(item.x + item.w, other.x + other.w) - axisStart;
                    }

                    if (touches && overlapStart < overlapEnd) {
                        segments = subtractRange(segments, overlapStart, overlapEnd);
                    }
                });

                return segments;
            }

            function refreshWallSegments(visibleBlocks) {
                visibleBlocks.forEach(item => {
                    item.block.querySelectorAll("[data-wall-segment]").forEach(segment => segment.remove());
                    ["north", "east", "south", "west"].forEach(side => {
                        const total = side === "east" || side === "west" ? item.h : item.w;
                        visibleEdgeSegments(item, visibleBlocks, side).forEach(segment => {
                            renderWallSegment(item.block, side, segment.start, segment.end, total);
                        });
                    });
                });
            }

            function refreshSharedWalls(activePanel) {
                const visibleBlocks = [...activePanel.querySelectorAll("[data-block]")].map(block => ({ block, ...readBlock(block) }));
                refreshWallSegments(visibleBlocks);
                return visibleBlocks;
            }

            function locationCenter(blocksForLocation) {
                if (blocksForLocation.length === 0) return null;
                const minX = Math.min(...blocksForLocation.map(item => item.x));
                const minY = Math.min(...blocksForLocation.map(item => item.y));
                const maxX = Math.max(...blocksForLocation.map(item => item.x + item.w));
                const maxY = Math.max(...blocksForLocation.map(item => item.y + item.h));
                return { x: (minX + maxX) / 2, y: (minY + maxY) / 2 };
            }

            function sharedTransitionEdge(fromBlocks, toBlocks) {
                let best = null;
                fromBlocks.forEach(from => {
                    toBlocks.forEach(to => {
                        if (from.x + from.w === to.x || to.x + to.w === from.x) {
                            const start = Math.max(from.y, to.y);
                            const end = Math.min(from.y + from.h, to.y + to.h);
                            const length = end - start;
                            if (length > 0 && (!best || length > best.length)) {
                                best = {
                                    length,
                                    orientation: "vertical",
                                    start,
                                    end,
                                    x: from.x + from.w === to.x ? to.x : from.x,
                                    y: start + length / 2
                                };
                            }
                        }

                        if (from.y + from.h === to.y || to.y + to.h === from.y) {
                            const start = Math.max(from.x, to.x);
                            const end = Math.min(from.x + from.w, to.x + to.w);
                            const length = end - start;
                            if (length > 0 && (!best || length > best.length)) {
                                best = {
                                    length,
                                    orientation: "horizontal",
                                    start,
                                    end,
                                    x: start + length / 2,
                                    y: from.y + from.h === to.y ? to.y : from.y
                                };
                            }
                        }
                    });
                });
                return best;
            }

            function positionTransitions(activePanel, visibleBlocks) {
                const markerPositions = [];
                activePanel.querySelectorAll("[data-transition-marker]").forEach(marker => {
                    const fromBlocks = visibleBlocks.filter(item => item.block.dataset.locationId === marker.dataset.fromLocationId);
                    const toBlocks = visibleBlocks.filter(item => item.block.dataset.locationId === marker.dataset.toLocationId);
                    if (fromBlocks.length === 0 || toBlocks.length === 0) {
                        marker.hidden = true;
                        return;
                    }

                    const sharedEdge = sharedTransitionEdge(fromBlocks, toBlocks);
                    const fromCenter = locationCenter(fromBlocks);
                    const toCenter = locationCenter(toBlocks);
                    marker.hidden = false;
                    marker.classList.toggle("is-shared-edge", !!sharedEdge);
                    const pairKey = [marker.dataset.fromLocationId, marker.dataset.toLocationId].sort().join("-");
                    const key = sharedEdge
                        ? `${pairKey}:${sharedEdge.orientation}:${sharedEdge.x}:${sharedEdge.y}:${sharedEdge.start}:${sharedEdge.end}`
                        : `${pairKey}:fallback`;
                    markerPositions.push({ marker, sharedEdge, fromCenter, toCenter, key });
                });

                const groups = markerPositions.reduce((map, item) => {
                    if (!map.has(item.key)) map.set(item.key, []);
                    map.get(item.key).push(item);
                    return map;
                }, new Map());

                groups.forEach(group => {
                    group.forEach((item, index) => {
                        const fraction = (index + 1) / (group.length + 1);
                        let x;
                        let y;
                        if (item.sharedEdge?.orientation === "vertical") {
                            x = item.sharedEdge.x;
                            y = item.sharedEdge.start + item.sharedEdge.length * fraction;
                        } else if (item.sharedEdge?.orientation === "horizontal") {
                            x = item.sharedEdge.start + item.sharedEdge.length * fraction;
                            y = item.sharedEdge.y;
                        } else {
                            x = item.fromCenter.x + (item.toCenter.x - item.fromCenter.x) * fraction;
                            y = item.fromCenter.y + (item.toCenter.y - item.fromCenter.y) * fraction;
                        }

                        item.marker.style.setProperty("--transition-x", x);
                        item.marker.style.setProperty("--transition-y", y);
                    });
                });
            }

            function cellFromPointer(grid, event) {
                const rect = grid.getBoundingClientRect();
                const gridWidth = Number(grid.dataset.gridWidth || 24);
                const gridHeight = Number(grid.dataset.gridHeight || 16);
                return {
                    x: Math.floor((event.clientX - rect.left) / (rect.width / gridWidth)),
                    y: Math.floor((event.clientY - rect.top) / (rect.height / gridHeight))
                };
            }

            function checkOverlaps() {
                const activePanel = panels.find(panel => panel.classList.contains("active"));
                if (!activePanel) return;
                const visibleBlocks = refreshSharedWalls(activePanel);
                positionTransitions(activePanel, visibleBlocks);
                let overlaps = false;
                visibleBlocks.forEach(a => {
                    a.block.classList.remove("overlap");
                    visibleBlocks.forEach(b => {
                        if (a === b) return;
                        const separated = a.x + a.w <= b.x || b.x + b.w <= a.x || a.y + a.h <= b.y || b.y + b.h <= a.y;
                        if (!separated) {
                            overlaps = true;
                            a.block.classList.add("overlap");
                            b.block.classList.add("overlap");
                        }
                    });
                });
                warning?.classList.toggle("d-none", !overlaps);
            }

            function applySizePreset() {
                const [width, height] = (sizePreset?.value || "2x1").split("x");
                if (addBlockWidth) addBlockWidth.value = width || "2";
                if (addBlockHeight) addBlockHeight.value = height || "1";
            }

            function updateSizePresets() {
                if (!sizePreset) return;
                const presets = sizePresets[addBlockType?.value || "Room"] || sizePresets.Room;
                sizePreset.innerHTML = "";
                presets.forEach(([value, label], index) => {
                    const option = document.createElement("option");
                    option.value = value;
                    option.textContent = label;
                    option.selected = index === 0;
                    sizePreset.append(option);
                });
                applySizePreset();
            }

            tabs.forEach(tab => tab.addEventListener("click", () => setActiveFloor(tab.dataset.floorTab)));
            toolboxTabs.forEach(tab => tab.addEventListener("click", () => setToolboxTab(tab.dataset.toolboxTab)));
            addBlockForm?.addEventListener("submit", addBlockAsync);
            editor.addEventListener("floor-plan-restore-state", event => restoreWorkspaceState(event.detail || {}));
            workspace?.addEventListener("submit", async event => {
                if (event.defaultPrevented) return;
                const form = event.target;
                if (!(form instanceof HTMLFormElement)) return;
                if (form === editor || form.id === "floor-plan-add-block-form" || form.matches("[data-background-settings-form]")) return;

                event.preventDefault();
                const state = workspaceState();
                setSaveStatus("saving");
                try {
                    const response = await fetch(form.action, {
                        method: (form.method || "POST").toUpperCase(),
                        body: new FormData(form),
                        credentials: "same-origin"
                    });

                    if (!response.ok) {
                        throw new Error("Save failed");
                    }

                    const html = await response.text();
                    const doc = new DOMParser().parseFromString(html, "text/html");
                    const nextWorkspace = doc.querySelector("[data-floor-plan-workspace]");
                    if (!nextWorkspace) {
                        throw new Error("The floor plan workspace could not be refreshed.");
                    }

                    cleanupModalArtifacts();
                    workspace.replaceWith(nextWorkspace);
                    window.initializeFloorPlanEditor({
                        activeFloorId: state.activeFloorId,
                        activeToolboxTab: state.activeToolboxTab,
                        selectedBlockId: state.selectedBlockId
                    });
                    window.requestAnimationFrame(() => {
                        const refreshedEditor = document.querySelector("[data-floor-plan-editor]");
                        refreshedEditor?.dispatchEvent(new CustomEvent("floor-plan-restore-state", { detail: state }));
                    });
                } catch (error) {
                    showWorkspaceError(error.message || "Save failed");
                }
            });

            editor.addEventListener("submit", event => {
                event.preventDefault();
                saveLayoutAsync();
            });

            blocks.forEach(attachBlockEvents);

            editor.addEventListener("pointermove", event => {
                if (!pointerState) return;
                const currentCell = cellFromPointer(pointerState.grid, event);
                const dx = currentCell.x - pointerState.start.x;
                const dy = currentCell.y - pointerState.start.y;
                if (pointerState.resizing) {
                    writeBlock(pointerState.block, {
                        ...pointerState.current,
                        w: pointerState.current.w + dx,
                        h: pointerState.current.h + dy
                    });
                } else {
                    writeBlock(pointerState.block, {
                        ...pointerState.current,
                        x: pointerState.current.x + dx,
                        y: pointerState.current.y + dy
                    });
                }
            });

            editor.addEventListener("pointerup", () => {
                if (pointerState) markDirty();
                pointerState = null;
            });
            editor.addEventListener("pointercancel", () => {
                if (pointerState) markDirty();
                pointerState = null;
            });

            editor.querySelectorAll("[data-block-field='x'],[data-block-field='y'],[data-block-field='w'],[data-block-field='h']").forEach(input => {
                const updateBlockField = () => {
                    if (!selectedBlock) return;
                    writeBlock(selectedBlock, readBlock(selectedBlock));
                    markDirty();
                };
                input.addEventListener("input", updateBlockField);
                input.addEventListener("change", updateBlockField);
            });

            editor.querySelectorAll("[data-block-field='type']").forEach(select => {
                select.addEventListener("change", () => {
                    if (!selectedBlock) return;
                    selectedBlock.className = selectedBlock.className
                        .split(" ")
                        .filter(name => !name.startsWith("floor-plan-block--"))
                        .concat(`floor-plan-block--${select.value.toLowerCase()}`)
                        .join(" ");
                    markDirty();
                });
            });

            editor.querySelectorAll("[data-block-field='location']").forEach(select => {
                select.addEventListener("change", () => {
                    if (!selectedBlock) return;
                    selectedBlock.dataset.locationId = select.value || "";
                    checkOverlaps();
                    markDirty();
                });
            });

            editor.querySelectorAll("[data-floor-width],[data-floor-height]").forEach(input => {
                input.addEventListener("input", () => {
                    const floorId = input.dataset.floorWidth || input.dataset.floorHeight;
                    updateFloorGrid(floorId);
                    markDirty();
                });
                input.addEventListener("change", () => {
                    const floorId = input.dataset.floorWidth || input.dataset.floorHeight;
                    updateFloorGrid(floorId);
                    markDirty();
                });
            });

            editor.querySelectorAll("input, select, textarea").forEach(input => {
                if (input.matches("[form='floor-plan-add-block-form'], [form='floor-plan-add-floor-form']")) return;
                if (input.matches("[form^='floor-plan-background-'], [form^='floor-plan-transition-add-']")) return;
                if (input.matches("[data-background-field]")) return;
                if (input.matches("[data-floor-width],[data-floor-height]")) return;
                if (input.matches("[data-block-field='x'],[data-block-field='y'],[data-block-field='w'],[data-block-field='h'],[data-block-field='type'],[data-block-field='location']")) return;
                const eventName = input.tagName === "TEXTAREA" || input.type === "text" ? "input" : "change";
                input.addEventListener(eventName, markDirty);
            });

            editor.querySelectorAll("[data-background-field]").forEach(input => {
                const eventName = input.type === "checkbox" ? "change" : "input";
                input.addEventListener(eventName, () => markBackgroundDirty(input.dataset.backgroundFloor));
            });

            sizePreset?.addEventListener("change", applySizePreset);
            addBlockType?.addEventListener("change", updateSizePresets);
            updateSizePresets();
            addBlockModes.forEach(input => input.addEventListener("change", updateAddBlockMode));
            updateAddBlockMode();

            const initialBlock = blocks.find(block => block.dataset.block === initialSelectedBlockId);
            if (initialBlock) {
                setActiveFloor(initialBlock.dataset.floorId);
                selectBlock(initialBlock);
            } else if (tabs[0]) {
                setActiveFloor(tabs[0].dataset.floorTab);
            }
            checkOverlaps();
        };

        window.initializeFloorPlanEditor();
    </script>
}